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BQ76PL455A-Q1: BQ76PL455A-Q1 Power mosfets

Ankit Tomar
Prodigy 60 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ78350, , BQ76PL455A

Hello,

I have a question regarding BQ76PL455A-Q1 working. In the EVM i didn't see any MOSFET'S that are used to control charging or discharging of the Battery pack connected.

How should i use/control  these mosfets in BQ76PL455A-Q1 as used in BQ78350 design. Should i use a microcontroller to detect FAULT_N (DO) and then use the microcontroller to send signals to Mos Drivers.

Also in case of short circuit how will this work will this send signal to FAULT_N pin as above and should i use the same way ?

  • 0
    TI__Genius 9401 points

    Hello,

    The BQ76PL455A-Q1 device is a slave battery monitor device, it does not have a processor. It reports the monitored data to the microcontroller in the system when requested by the MCU. To control the FETs, you could use the MCU to control the FET drivers based on the cell reading monitored by the BQ76PL455A-Q1.

    FAULT_N pin can detect different faults (when enabled and faults not masked), not just OV/UV, so I would be cautious of using FAULT_N signal only to determine when to start charge/discharge. For more detailed information about FAULT_N and faults in general please review section 7.3.12 "FAULT Sensing and Signaling" of the device datasheet.  

    Regarding your short circuit questions, the BQ76PL455A device does not have current sense capability. 

    Best regards,

    Leslie

  • 0 in reply to Leslie Marquez
    Prodigy 60 points

    Can i use FAULT_N pin to trigger the mosfets on or off with using a MCU.

    If not which design you would recommend me to use for designing an Electric Vehicle BMS.

  • 0 in reply to Leslie Marquez
    Prodigy 60 points

    Can i use FAULT_N pin to trigger the mosfets on or off with using a MCU.

    If not which design you would recommend me to use for designing an Electric Vehicle BMS